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staging: board: Migrate away from __pm_genpd_name_add_device()
[mirror_ubuntu-zesty-kernel.git] / net / ipv4 / devinet.c
1 /*
2 * NET3 IP device support routines.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Derived from the IP parts of dev.c 1.0.19
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
13 *
14 * Additional Authors:
15 * Alan Cox, <gw4pts@gw4pts.ampr.org>
16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
17 *
18 * Changes:
19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
20 * lists.
21 * Cyrus Durgin: updated for kmod
22 * Matthias Andree: in devinet_ioctl, compare label and
23 * address (4.4BSD alias style support),
24 * fall back to comparing just the label
25 * if no match found.
26 */
27
28
29 #include <asm/uaccess.h>
30 #include <linux/bitops.h>
31 #include <linux/capability.h>
32 #include <linux/module.h>
33 #include <linux/types.h>
34 #include <linux/kernel.h>
35 #include <linux/string.h>
36 #include <linux/mm.h>
37 #include <linux/socket.h>
38 #include <linux/sockios.h>
39 #include <linux/in.h>
40 #include <linux/errno.h>
41 #include <linux/interrupt.h>
42 #include <linux/if_addr.h>
43 #include <linux/if_ether.h>
44 #include <linux/inet.h>
45 #include <linux/netdevice.h>
46 #include <linux/etherdevice.h>
47 #include <linux/skbuff.h>
48 #include <linux/init.h>
49 #include <linux/notifier.h>
50 #include <linux/inetdevice.h>
51 #include <linux/igmp.h>
52 #include <linux/slab.h>
53 #include <linux/hash.h>
54 #ifdef CONFIG_SYSCTL
55 #include <linux/sysctl.h>
56 #endif
57 #include <linux/kmod.h>
58 #include <linux/netconf.h>
59
60 #include <net/arp.h>
61 #include <net/ip.h>
62 #include <net/route.h>
63 #include <net/ip_fib.h>
64 #include <net/rtnetlink.h>
65 #include <net/net_namespace.h>
66 #include <net/addrconf.h>
67
68 #include "fib_lookup.h"
69
70 static struct ipv4_devconf ipv4_devconf = {
71 .data = {
72 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
73 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
74 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
75 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
76 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
77 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
78 },
79 };
80
81 static struct ipv4_devconf ipv4_devconf_dflt = {
82 .data = {
83 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
84 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
85 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
86 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
87 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
88 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
89 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
90 },
91 };
92
93 #define IPV4_DEVCONF_DFLT(net, attr) \
94 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
95
96 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
97 [IFA_LOCAL] = { .type = NLA_U32 },
98 [IFA_ADDRESS] = { .type = NLA_U32 },
99 [IFA_BROADCAST] = { .type = NLA_U32 },
100 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
101 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
102 [IFA_FLAGS] = { .type = NLA_U32 },
103 };
104
105 #define IN4_ADDR_HSIZE_SHIFT 8
106 #define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
107
108 static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
109
110 static u32 inet_addr_hash(const struct net *net, __be32 addr)
111 {
112 u32 val = (__force u32) addr ^ net_hash_mix(net);
113
114 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
115 }
116
117 static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
118 {
119 u32 hash = inet_addr_hash(net, ifa->ifa_local);
120
121 ASSERT_RTNL();
122 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
123 }
124
125 static void inet_hash_remove(struct in_ifaddr *ifa)
126 {
127 ASSERT_RTNL();
128 hlist_del_init_rcu(&ifa->hash);
129 }
130
131 /**
132 * __ip_dev_find - find the first device with a given source address.
133 * @net: the net namespace
134 * @addr: the source address
135 * @devref: if true, take a reference on the found device
136 *
137 * If a caller uses devref=false, it should be protected by RCU, or RTNL
138 */
139 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
140 {
141 u32 hash = inet_addr_hash(net, addr);
142 struct net_device *result = NULL;
143 struct in_ifaddr *ifa;
144
145 rcu_read_lock();
146 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) {
147 if (ifa->ifa_local == addr) {
148 struct net_device *dev = ifa->ifa_dev->dev;
149
150 if (!net_eq(dev_net(dev), net))
151 continue;
152 result = dev;
153 break;
154 }
155 }
156 if (!result) {
157 struct flowi4 fl4 = { .daddr = addr };
158 struct fib_result res = { 0 };
159 struct fib_table *local;
160
161 /* Fallback to FIB local table so that communication
162 * over loopback subnets work.
163 */
164 local = fib_get_table(net, RT_TABLE_LOCAL);
165 if (local &&
166 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
167 res.type == RTN_LOCAL)
168 result = FIB_RES_DEV(res);
169 }
170 if (result && devref)
171 dev_hold(result);
172 rcu_read_unlock();
173 return result;
174 }
175 EXPORT_SYMBOL(__ip_dev_find);
176
177 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
178
179 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
180 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
181 int destroy);
182 #ifdef CONFIG_SYSCTL
183 static int devinet_sysctl_register(struct in_device *idev);
184 static void devinet_sysctl_unregister(struct in_device *idev);
185 #else
186 static int devinet_sysctl_register(struct in_device *idev)
187 {
188 return 0;
189 }
190 static void devinet_sysctl_unregister(struct in_device *idev)
191 {
192 }
193 #endif
194
195 /* Locks all the inet devices. */
196
197 static struct in_ifaddr *inet_alloc_ifa(void)
198 {
199 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
200 }
201
202 static void inet_rcu_free_ifa(struct rcu_head *head)
203 {
204 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
205 if (ifa->ifa_dev)
206 in_dev_put(ifa->ifa_dev);
207 kfree(ifa);
208 }
209
210 static void inet_free_ifa(struct in_ifaddr *ifa)
211 {
212 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
213 }
214
215 void in_dev_finish_destroy(struct in_device *idev)
216 {
217 struct net_device *dev = idev->dev;
218
219 WARN_ON(idev->ifa_list);
220 WARN_ON(idev->mc_list);
221 kfree(rcu_dereference_protected(idev->mc_hash, 1));
222 #ifdef NET_REFCNT_DEBUG
223 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
224 #endif
225 dev_put(dev);
226 if (!idev->dead)
227 pr_err("Freeing alive in_device %p\n", idev);
228 else
229 kfree(idev);
230 }
231 EXPORT_SYMBOL(in_dev_finish_destroy);
232
233 static struct in_device *inetdev_init(struct net_device *dev)
234 {
235 struct in_device *in_dev;
236 int err = -ENOMEM;
237
238 ASSERT_RTNL();
239
240 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
241 if (!in_dev)
242 goto out;
243 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
244 sizeof(in_dev->cnf));
245 in_dev->cnf.sysctl = NULL;
246 in_dev->dev = dev;
247 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
248 if (!in_dev->arp_parms)
249 goto out_kfree;
250 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
251 dev_disable_lro(dev);
252 /* Reference in_dev->dev */
253 dev_hold(dev);
254 /* Account for reference dev->ip_ptr (below) */
255 in_dev_hold(in_dev);
256
257 err = devinet_sysctl_register(in_dev);
258 if (err) {
259 in_dev->dead = 1;
260 in_dev_put(in_dev);
261 in_dev = NULL;
262 goto out;
263 }
264 ip_mc_init_dev(in_dev);
265 if (dev->flags & IFF_UP)
266 ip_mc_up(in_dev);
267
268 /* we can receive as soon as ip_ptr is set -- do this last */
269 rcu_assign_pointer(dev->ip_ptr, in_dev);
270 out:
271 return in_dev ?: ERR_PTR(err);
272 out_kfree:
273 kfree(in_dev);
274 in_dev = NULL;
275 goto out;
276 }
277
278 static void in_dev_rcu_put(struct rcu_head *head)
279 {
280 struct in_device *idev = container_of(head, struct in_device, rcu_head);
281 in_dev_put(idev);
282 }
283
284 static void inetdev_destroy(struct in_device *in_dev)
285 {
286 struct in_ifaddr *ifa;
287 struct net_device *dev;
288
289 ASSERT_RTNL();
290
291 dev = in_dev->dev;
292
293 in_dev->dead = 1;
294
295 ip_mc_destroy_dev(in_dev);
296
297 while ((ifa = in_dev->ifa_list) != NULL) {
298 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
299 inet_free_ifa(ifa);
300 }
301
302 RCU_INIT_POINTER(dev->ip_ptr, NULL);
303
304 devinet_sysctl_unregister(in_dev);
305 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
306 arp_ifdown(dev);
307
308 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
309 }
310
311 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
312 {
313 rcu_read_lock();
314 for_primary_ifa(in_dev) {
315 if (inet_ifa_match(a, ifa)) {
316 if (!b || inet_ifa_match(b, ifa)) {
317 rcu_read_unlock();
318 return 1;
319 }
320 }
321 } endfor_ifa(in_dev);
322 rcu_read_unlock();
323 return 0;
324 }
325
326 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
327 int destroy, struct nlmsghdr *nlh, u32 portid)
328 {
329 struct in_ifaddr *promote = NULL;
330 struct in_ifaddr *ifa, *ifa1 = *ifap;
331 struct in_ifaddr *last_prim = in_dev->ifa_list;
332 struct in_ifaddr *prev_prom = NULL;
333 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
334
335 ASSERT_RTNL();
336
337 /* 1. Deleting primary ifaddr forces deletion all secondaries
338 * unless alias promotion is set
339 **/
340
341 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
342 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
343
344 while ((ifa = *ifap1) != NULL) {
345 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
346 ifa1->ifa_scope <= ifa->ifa_scope)
347 last_prim = ifa;
348
349 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
350 ifa1->ifa_mask != ifa->ifa_mask ||
351 !inet_ifa_match(ifa1->ifa_address, ifa)) {
352 ifap1 = &ifa->ifa_next;
353 prev_prom = ifa;
354 continue;
355 }
356
357 if (!do_promote) {
358 inet_hash_remove(ifa);
359 *ifap1 = ifa->ifa_next;
360
361 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
362 blocking_notifier_call_chain(&inetaddr_chain,
363 NETDEV_DOWN, ifa);
364 inet_free_ifa(ifa);
365 } else {
366 promote = ifa;
367 break;
368 }
369 }
370 }
371
372 /* On promotion all secondaries from subnet are changing
373 * the primary IP, we must remove all their routes silently
374 * and later to add them back with new prefsrc. Do this
375 * while all addresses are on the device list.
376 */
377 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
378 if (ifa1->ifa_mask == ifa->ifa_mask &&
379 inet_ifa_match(ifa1->ifa_address, ifa))
380 fib_del_ifaddr(ifa, ifa1);
381 }
382
383 /* 2. Unlink it */
384
385 *ifap = ifa1->ifa_next;
386 inet_hash_remove(ifa1);
387
388 /* 3. Announce address deletion */
389
390 /* Send message first, then call notifier.
391 At first sight, FIB update triggered by notifier
392 will refer to already deleted ifaddr, that could confuse
393 netlink listeners. It is not true: look, gated sees
394 that route deleted and if it still thinks that ifaddr
395 is valid, it will try to restore deleted routes... Grr.
396 So that, this order is correct.
397 */
398 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
399 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
400
401 if (promote) {
402 struct in_ifaddr *next_sec = promote->ifa_next;
403
404 if (prev_prom) {
405 prev_prom->ifa_next = promote->ifa_next;
406 promote->ifa_next = last_prim->ifa_next;
407 last_prim->ifa_next = promote;
408 }
409
410 promote->ifa_flags &= ~IFA_F_SECONDARY;
411 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
412 blocking_notifier_call_chain(&inetaddr_chain,
413 NETDEV_UP, promote);
414 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
415 if (ifa1->ifa_mask != ifa->ifa_mask ||
416 !inet_ifa_match(ifa1->ifa_address, ifa))
417 continue;
418 fib_add_ifaddr(ifa);
419 }
420
421 }
422 if (destroy)
423 inet_free_ifa(ifa1);
424 }
425
426 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
427 int destroy)
428 {
429 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
430 }
431
432 static void check_lifetime(struct work_struct *work);
433
434 static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
435
436 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
437 u32 portid)
438 {
439 struct in_device *in_dev = ifa->ifa_dev;
440 struct in_ifaddr *ifa1, **ifap, **last_primary;
441
442 ASSERT_RTNL();
443
444 if (!ifa->ifa_local) {
445 inet_free_ifa(ifa);
446 return 0;
447 }
448
449 ifa->ifa_flags &= ~IFA_F_SECONDARY;
450 last_primary = &in_dev->ifa_list;
451
452 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
453 ifap = &ifa1->ifa_next) {
454 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
455 ifa->ifa_scope <= ifa1->ifa_scope)
456 last_primary = &ifa1->ifa_next;
457 if (ifa1->ifa_mask == ifa->ifa_mask &&
458 inet_ifa_match(ifa1->ifa_address, ifa)) {
459 if (ifa1->ifa_local == ifa->ifa_local) {
460 inet_free_ifa(ifa);
461 return -EEXIST;
462 }
463 if (ifa1->ifa_scope != ifa->ifa_scope) {
464 inet_free_ifa(ifa);
465 return -EINVAL;
466 }
467 ifa->ifa_flags |= IFA_F_SECONDARY;
468 }
469 }
470
471 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
472 prandom_seed((__force u32) ifa->ifa_local);
473 ifap = last_primary;
474 }
475
476 ifa->ifa_next = *ifap;
477 *ifap = ifa;
478
479 inet_hash_insert(dev_net(in_dev->dev), ifa);
480
481 cancel_delayed_work(&check_lifetime_work);
482 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
483
484 /* Send message first, then call notifier.
485 Notifier will trigger FIB update, so that
486 listeners of netlink will know about new ifaddr */
487 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
488 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
489
490 return 0;
491 }
492
493 static int inet_insert_ifa(struct in_ifaddr *ifa)
494 {
495 return __inet_insert_ifa(ifa, NULL, 0);
496 }
497
498 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
499 {
500 struct in_device *in_dev = __in_dev_get_rtnl(dev);
501
502 ASSERT_RTNL();
503
504 if (!in_dev) {
505 inet_free_ifa(ifa);
506 return -ENOBUFS;
507 }
508 ipv4_devconf_setall(in_dev);
509 neigh_parms_data_state_setall(in_dev->arp_parms);
510 if (ifa->ifa_dev != in_dev) {
511 WARN_ON(ifa->ifa_dev);
512 in_dev_hold(in_dev);
513 ifa->ifa_dev = in_dev;
514 }
515 if (ipv4_is_loopback(ifa->ifa_local))
516 ifa->ifa_scope = RT_SCOPE_HOST;
517 return inet_insert_ifa(ifa);
518 }
519
520 /* Caller must hold RCU or RTNL :
521 * We dont take a reference on found in_device
522 */
523 struct in_device *inetdev_by_index(struct net *net, int ifindex)
524 {
525 struct net_device *dev;
526 struct in_device *in_dev = NULL;
527
528 rcu_read_lock();
529 dev = dev_get_by_index_rcu(net, ifindex);
530 if (dev)
531 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
532 rcu_read_unlock();
533 return in_dev;
534 }
535 EXPORT_SYMBOL(inetdev_by_index);
536
537 /* Called only from RTNL semaphored context. No locks. */
538
539 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
540 __be32 mask)
541 {
542 ASSERT_RTNL();
543
544 for_primary_ifa(in_dev) {
545 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
546 return ifa;
547 } endfor_ifa(in_dev);
548 return NULL;
549 }
550
551 static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa)
552 {
553 struct ip_mreqn mreq = {
554 .imr_multiaddr.s_addr = ifa->ifa_address,
555 .imr_ifindex = ifa->ifa_dev->dev->ifindex,
556 };
557 int ret;
558
559 ASSERT_RTNL();
560
561 lock_sock(sk);
562 if (join)
563 ret = ip_mc_join_group(sk, &mreq);
564 else
565 ret = ip_mc_leave_group(sk, &mreq);
566 release_sock(sk);
567
568 return ret;
569 }
570
571 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
572 {
573 struct net *net = sock_net(skb->sk);
574 struct nlattr *tb[IFA_MAX+1];
575 struct in_device *in_dev;
576 struct ifaddrmsg *ifm;
577 struct in_ifaddr *ifa, **ifap;
578 int err = -EINVAL;
579
580 ASSERT_RTNL();
581
582 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
583 if (err < 0)
584 goto errout;
585
586 ifm = nlmsg_data(nlh);
587 in_dev = inetdev_by_index(net, ifm->ifa_index);
588 if (!in_dev) {
589 err = -ENODEV;
590 goto errout;
591 }
592
593 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
594 ifap = &ifa->ifa_next) {
595 if (tb[IFA_LOCAL] &&
596 ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
597 continue;
598
599 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
600 continue;
601
602 if (tb[IFA_ADDRESS] &&
603 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
604 !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
605 continue;
606
607 if (ipv4_is_multicast(ifa->ifa_address))
608 ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa);
609 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
610 return 0;
611 }
612
613 err = -EADDRNOTAVAIL;
614 errout:
615 return err;
616 }
617
618 #define INFINITY_LIFE_TIME 0xFFFFFFFF
619
620 static void check_lifetime(struct work_struct *work)
621 {
622 unsigned long now, next, next_sec, next_sched;
623 struct in_ifaddr *ifa;
624 struct hlist_node *n;
625 int i;
626
627 now = jiffies;
628 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
629
630 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
631 bool change_needed = false;
632
633 rcu_read_lock();
634 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
635 unsigned long age;
636
637 if (ifa->ifa_flags & IFA_F_PERMANENT)
638 continue;
639
640 /* We try to batch several events at once. */
641 age = (now - ifa->ifa_tstamp +
642 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
643
644 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
645 age >= ifa->ifa_valid_lft) {
646 change_needed = true;
647 } else if (ifa->ifa_preferred_lft ==
648 INFINITY_LIFE_TIME) {
649 continue;
650 } else if (age >= ifa->ifa_preferred_lft) {
651 if (time_before(ifa->ifa_tstamp +
652 ifa->ifa_valid_lft * HZ, next))
653 next = ifa->ifa_tstamp +
654 ifa->ifa_valid_lft * HZ;
655
656 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
657 change_needed = true;
658 } else if (time_before(ifa->ifa_tstamp +
659 ifa->ifa_preferred_lft * HZ,
660 next)) {
661 next = ifa->ifa_tstamp +
662 ifa->ifa_preferred_lft * HZ;
663 }
664 }
665 rcu_read_unlock();
666 if (!change_needed)
667 continue;
668 rtnl_lock();
669 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
670 unsigned long age;
671
672 if (ifa->ifa_flags & IFA_F_PERMANENT)
673 continue;
674
675 /* We try to batch several events at once. */
676 age = (now - ifa->ifa_tstamp +
677 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
678
679 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
680 age >= ifa->ifa_valid_lft) {
681 struct in_ifaddr **ifap;
682
683 for (ifap = &ifa->ifa_dev->ifa_list;
684 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
685 if (*ifap == ifa) {
686 inet_del_ifa(ifa->ifa_dev,
687 ifap, 1);
688 break;
689 }
690 }
691 } else if (ifa->ifa_preferred_lft !=
692 INFINITY_LIFE_TIME &&
693 age >= ifa->ifa_preferred_lft &&
694 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
695 ifa->ifa_flags |= IFA_F_DEPRECATED;
696 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
697 }
698 }
699 rtnl_unlock();
700 }
701
702 next_sec = round_jiffies_up(next);
703 next_sched = next;
704
705 /* If rounded timeout is accurate enough, accept it. */
706 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
707 next_sched = next_sec;
708
709 now = jiffies;
710 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
711 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
712 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
713
714 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
715 next_sched - now);
716 }
717
718 static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
719 __u32 prefered_lft)
720 {
721 unsigned long timeout;
722
723 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
724
725 timeout = addrconf_timeout_fixup(valid_lft, HZ);
726 if (addrconf_finite_timeout(timeout))
727 ifa->ifa_valid_lft = timeout;
728 else
729 ifa->ifa_flags |= IFA_F_PERMANENT;
730
731 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
732 if (addrconf_finite_timeout(timeout)) {
733 if (timeout == 0)
734 ifa->ifa_flags |= IFA_F_DEPRECATED;
735 ifa->ifa_preferred_lft = timeout;
736 }
737 ifa->ifa_tstamp = jiffies;
738 if (!ifa->ifa_cstamp)
739 ifa->ifa_cstamp = ifa->ifa_tstamp;
740 }
741
742 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
743 __u32 *pvalid_lft, __u32 *pprefered_lft)
744 {
745 struct nlattr *tb[IFA_MAX+1];
746 struct in_ifaddr *ifa;
747 struct ifaddrmsg *ifm;
748 struct net_device *dev;
749 struct in_device *in_dev;
750 int err;
751
752 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
753 if (err < 0)
754 goto errout;
755
756 ifm = nlmsg_data(nlh);
757 err = -EINVAL;
758 if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
759 goto errout;
760
761 dev = __dev_get_by_index(net, ifm->ifa_index);
762 err = -ENODEV;
763 if (!dev)
764 goto errout;
765
766 in_dev = __in_dev_get_rtnl(dev);
767 err = -ENOBUFS;
768 if (!in_dev)
769 goto errout;
770
771 ifa = inet_alloc_ifa();
772 if (!ifa)
773 /*
774 * A potential indev allocation can be left alive, it stays
775 * assigned to its device and is destroy with it.
776 */
777 goto errout;
778
779 ipv4_devconf_setall(in_dev);
780 neigh_parms_data_state_setall(in_dev->arp_parms);
781 in_dev_hold(in_dev);
782
783 if (!tb[IFA_ADDRESS])
784 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
785
786 INIT_HLIST_NODE(&ifa->hash);
787 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
788 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
789 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
790 ifm->ifa_flags;
791 ifa->ifa_scope = ifm->ifa_scope;
792 ifa->ifa_dev = in_dev;
793
794 ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
795 ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
796
797 if (tb[IFA_BROADCAST])
798 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
799
800 if (tb[IFA_LABEL])
801 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
802 else
803 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
804
805 if (tb[IFA_CACHEINFO]) {
806 struct ifa_cacheinfo *ci;
807
808 ci = nla_data(tb[IFA_CACHEINFO]);
809 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
810 err = -EINVAL;
811 goto errout_free;
812 }
813 *pvalid_lft = ci->ifa_valid;
814 *pprefered_lft = ci->ifa_prefered;
815 }
816
817 return ifa;
818
819 errout_free:
820 inet_free_ifa(ifa);
821 errout:
822 return ERR_PTR(err);
823 }
824
825 static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
826 {
827 struct in_device *in_dev = ifa->ifa_dev;
828 struct in_ifaddr *ifa1, **ifap;
829
830 if (!ifa->ifa_local)
831 return NULL;
832
833 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
834 ifap = &ifa1->ifa_next) {
835 if (ifa1->ifa_mask == ifa->ifa_mask &&
836 inet_ifa_match(ifa1->ifa_address, ifa) &&
837 ifa1->ifa_local == ifa->ifa_local)
838 return ifa1;
839 }
840 return NULL;
841 }
842
843 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
844 {
845 struct net *net = sock_net(skb->sk);
846 struct in_ifaddr *ifa;
847 struct in_ifaddr *ifa_existing;
848 __u32 valid_lft = INFINITY_LIFE_TIME;
849 __u32 prefered_lft = INFINITY_LIFE_TIME;
850
851 ASSERT_RTNL();
852
853 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
854 if (IS_ERR(ifa))
855 return PTR_ERR(ifa);
856
857 ifa_existing = find_matching_ifa(ifa);
858 if (!ifa_existing) {
859 /* It would be best to check for !NLM_F_CREATE here but
860 * userspace already relies on not having to provide this.
861 */
862 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
863 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
864 int ret = ip_mc_config(net->ipv4.mc_autojoin_sk,
865 true, ifa);
866
867 if (ret < 0) {
868 inet_free_ifa(ifa);
869 return ret;
870 }
871 }
872 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
873 } else {
874 inet_free_ifa(ifa);
875
876 if (nlh->nlmsg_flags & NLM_F_EXCL ||
877 !(nlh->nlmsg_flags & NLM_F_REPLACE))
878 return -EEXIST;
879 ifa = ifa_existing;
880 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
881 cancel_delayed_work(&check_lifetime_work);
882 queue_delayed_work(system_power_efficient_wq,
883 &check_lifetime_work, 0);
884 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
885 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
886 }
887 return 0;
888 }
889
890 /*
891 * Determine a default network mask, based on the IP address.
892 */
893
894 static int inet_abc_len(__be32 addr)
895 {
896 int rc = -1; /* Something else, probably a multicast. */
897
898 if (ipv4_is_zeronet(addr))
899 rc = 0;
900 else {
901 __u32 haddr = ntohl(addr);
902
903 if (IN_CLASSA(haddr))
904 rc = 8;
905 else if (IN_CLASSB(haddr))
906 rc = 16;
907 else if (IN_CLASSC(haddr))
908 rc = 24;
909 }
910
911 return rc;
912 }
913
914
915 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
916 {
917 struct ifreq ifr;
918 struct sockaddr_in sin_orig;
919 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
920 struct in_device *in_dev;
921 struct in_ifaddr **ifap = NULL;
922 struct in_ifaddr *ifa = NULL;
923 struct net_device *dev;
924 char *colon;
925 int ret = -EFAULT;
926 int tryaddrmatch = 0;
927
928 /*
929 * Fetch the caller's info block into kernel space
930 */
931
932 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
933 goto out;
934 ifr.ifr_name[IFNAMSIZ - 1] = 0;
935
936 /* save original address for comparison */
937 memcpy(&sin_orig, sin, sizeof(*sin));
938
939 colon = strchr(ifr.ifr_name, ':');
940 if (colon)
941 *colon = 0;
942
943 dev_load(net, ifr.ifr_name);
944
945 switch (cmd) {
946 case SIOCGIFADDR: /* Get interface address */
947 case SIOCGIFBRDADDR: /* Get the broadcast address */
948 case SIOCGIFDSTADDR: /* Get the destination address */
949 case SIOCGIFNETMASK: /* Get the netmask for the interface */
950 /* Note that these ioctls will not sleep,
951 so that we do not impose a lock.
952 One day we will be forced to put shlock here (I mean SMP)
953 */
954 tryaddrmatch = (sin_orig.sin_family == AF_INET);
955 memset(sin, 0, sizeof(*sin));
956 sin->sin_family = AF_INET;
957 break;
958
959 case SIOCSIFFLAGS:
960 ret = -EPERM;
961 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
962 goto out;
963 break;
964 case SIOCSIFADDR: /* Set interface address (and family) */
965 case SIOCSIFBRDADDR: /* Set the broadcast address */
966 case SIOCSIFDSTADDR: /* Set the destination address */
967 case SIOCSIFNETMASK: /* Set the netmask for the interface */
968 ret = -EPERM;
969 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
970 goto out;
971 ret = -EINVAL;
972 if (sin->sin_family != AF_INET)
973 goto out;
974 break;
975 default:
976 ret = -EINVAL;
977 goto out;
978 }
979
980 rtnl_lock();
981
982 ret = -ENODEV;
983 dev = __dev_get_by_name(net, ifr.ifr_name);
984 if (!dev)
985 goto done;
986
987 if (colon)
988 *colon = ':';
989
990 in_dev = __in_dev_get_rtnl(dev);
991 if (in_dev) {
992 if (tryaddrmatch) {
993 /* Matthias Andree */
994 /* compare label and address (4.4BSD style) */
995 /* note: we only do this for a limited set of ioctls
996 and only if the original address family was AF_INET.
997 This is checked above. */
998 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
999 ifap = &ifa->ifa_next) {
1000 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
1001 sin_orig.sin_addr.s_addr ==
1002 ifa->ifa_local) {
1003 break; /* found */
1004 }
1005 }
1006 }
1007 /* we didn't get a match, maybe the application is
1008 4.3BSD-style and passed in junk so we fall back to
1009 comparing just the label */
1010 if (!ifa) {
1011 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
1012 ifap = &ifa->ifa_next)
1013 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
1014 break;
1015 }
1016 }
1017
1018 ret = -EADDRNOTAVAIL;
1019 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1020 goto done;
1021
1022 switch (cmd) {
1023 case SIOCGIFADDR: /* Get interface address */
1024 sin->sin_addr.s_addr = ifa->ifa_local;
1025 goto rarok;
1026
1027 case SIOCGIFBRDADDR: /* Get the broadcast address */
1028 sin->sin_addr.s_addr = ifa->ifa_broadcast;
1029 goto rarok;
1030
1031 case SIOCGIFDSTADDR: /* Get the destination address */
1032 sin->sin_addr.s_addr = ifa->ifa_address;
1033 goto rarok;
1034
1035 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1036 sin->sin_addr.s_addr = ifa->ifa_mask;
1037 goto rarok;
1038
1039 case SIOCSIFFLAGS:
1040 if (colon) {
1041 ret = -EADDRNOTAVAIL;
1042 if (!ifa)
1043 break;
1044 ret = 0;
1045 if (!(ifr.ifr_flags & IFF_UP))
1046 inet_del_ifa(in_dev, ifap, 1);
1047 break;
1048 }
1049 ret = dev_change_flags(dev, ifr.ifr_flags);
1050 break;
1051
1052 case SIOCSIFADDR: /* Set interface address (and family) */
1053 ret = -EINVAL;
1054 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1055 break;
1056
1057 if (!ifa) {
1058 ret = -ENOBUFS;
1059 ifa = inet_alloc_ifa();
1060 if (!ifa)
1061 break;
1062 INIT_HLIST_NODE(&ifa->hash);
1063 if (colon)
1064 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
1065 else
1066 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1067 } else {
1068 ret = 0;
1069 if (ifa->ifa_local == sin->sin_addr.s_addr)
1070 break;
1071 inet_del_ifa(in_dev, ifap, 0);
1072 ifa->ifa_broadcast = 0;
1073 ifa->ifa_scope = 0;
1074 }
1075
1076 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1077
1078 if (!(dev->flags & IFF_POINTOPOINT)) {
1079 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1080 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1081 if ((dev->flags & IFF_BROADCAST) &&
1082 ifa->ifa_prefixlen < 31)
1083 ifa->ifa_broadcast = ifa->ifa_address |
1084 ~ifa->ifa_mask;
1085 } else {
1086 ifa->ifa_prefixlen = 32;
1087 ifa->ifa_mask = inet_make_mask(32);
1088 }
1089 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1090 ret = inet_set_ifa(dev, ifa);
1091 break;
1092
1093 case SIOCSIFBRDADDR: /* Set the broadcast address */
1094 ret = 0;
1095 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1096 inet_del_ifa(in_dev, ifap, 0);
1097 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1098 inet_insert_ifa(ifa);
1099 }
1100 break;
1101
1102 case SIOCSIFDSTADDR: /* Set the destination address */
1103 ret = 0;
1104 if (ifa->ifa_address == sin->sin_addr.s_addr)
1105 break;
1106 ret = -EINVAL;
1107 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1108 break;
1109 ret = 0;
1110 inet_del_ifa(in_dev, ifap, 0);
1111 ifa->ifa_address = sin->sin_addr.s_addr;
1112 inet_insert_ifa(ifa);
1113 break;
1114
1115 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1116
1117 /*
1118 * The mask we set must be legal.
1119 */
1120 ret = -EINVAL;
1121 if (bad_mask(sin->sin_addr.s_addr, 0))
1122 break;
1123 ret = 0;
1124 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1125 __be32 old_mask = ifa->ifa_mask;
1126 inet_del_ifa(in_dev, ifap, 0);
1127 ifa->ifa_mask = sin->sin_addr.s_addr;
1128 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1129
1130 /* See if current broadcast address matches
1131 * with current netmask, then recalculate
1132 * the broadcast address. Otherwise it's a
1133 * funny address, so don't touch it since
1134 * the user seems to know what (s)he's doing...
1135 */
1136 if ((dev->flags & IFF_BROADCAST) &&
1137 (ifa->ifa_prefixlen < 31) &&
1138 (ifa->ifa_broadcast ==
1139 (ifa->ifa_local|~old_mask))) {
1140 ifa->ifa_broadcast = (ifa->ifa_local |
1141 ~sin->sin_addr.s_addr);
1142 }
1143 inet_insert_ifa(ifa);
1144 }
1145 break;
1146 }
1147 done:
1148 rtnl_unlock();
1149 out:
1150 return ret;
1151 rarok:
1152 rtnl_unlock();
1153 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
1154 goto out;
1155 }
1156
1157 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
1158 {
1159 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1160 struct in_ifaddr *ifa;
1161 struct ifreq ifr;
1162 int done = 0;
1163
1164 if (!in_dev)
1165 goto out;
1166
1167 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1168 if (!buf) {
1169 done += sizeof(ifr);
1170 continue;
1171 }
1172 if (len < (int) sizeof(ifr))
1173 break;
1174 memset(&ifr, 0, sizeof(struct ifreq));
1175 strcpy(ifr.ifr_name, ifa->ifa_label);
1176
1177 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1178 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1179 ifa->ifa_local;
1180
1181 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
1182 done = -EFAULT;
1183 break;
1184 }
1185 buf += sizeof(struct ifreq);
1186 len -= sizeof(struct ifreq);
1187 done += sizeof(struct ifreq);
1188 }
1189 out:
1190 return done;
1191 }
1192
1193 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1194 {
1195 __be32 addr = 0;
1196 struct in_device *in_dev;
1197 struct net *net = dev_net(dev);
1198
1199 rcu_read_lock();
1200 in_dev = __in_dev_get_rcu(dev);
1201 if (!in_dev)
1202 goto no_in_dev;
1203
1204 for_primary_ifa(in_dev) {
1205 if (ifa->ifa_scope > scope)
1206 continue;
1207 if (!dst || inet_ifa_match(dst, ifa)) {
1208 addr = ifa->ifa_local;
1209 break;
1210 }
1211 if (!addr)
1212 addr = ifa->ifa_local;
1213 } endfor_ifa(in_dev);
1214
1215 if (addr)
1216 goto out_unlock;
1217 no_in_dev:
1218
1219 /* Not loopback addresses on loopback should be preferred
1220 in this case. It is important that lo is the first interface
1221 in dev_base list.
1222 */
1223 for_each_netdev_rcu(net, dev) {
1224 in_dev = __in_dev_get_rcu(dev);
1225 if (!in_dev)
1226 continue;
1227
1228 for_primary_ifa(in_dev) {
1229 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1230 ifa->ifa_scope <= scope) {
1231 addr = ifa->ifa_local;
1232 goto out_unlock;
1233 }
1234 } endfor_ifa(in_dev);
1235 }
1236 out_unlock:
1237 rcu_read_unlock();
1238 return addr;
1239 }
1240 EXPORT_SYMBOL(inet_select_addr);
1241
1242 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1243 __be32 local, int scope)
1244 {
1245 int same = 0;
1246 __be32 addr = 0;
1247
1248 for_ifa(in_dev) {
1249 if (!addr &&
1250 (local == ifa->ifa_local || !local) &&
1251 ifa->ifa_scope <= scope) {
1252 addr = ifa->ifa_local;
1253 if (same)
1254 break;
1255 }
1256 if (!same) {
1257 same = (!local || inet_ifa_match(local, ifa)) &&
1258 (!dst || inet_ifa_match(dst, ifa));
1259 if (same && addr) {
1260 if (local || !dst)
1261 break;
1262 /* Is the selected addr into dst subnet? */
1263 if (inet_ifa_match(addr, ifa))
1264 break;
1265 /* No, then can we use new local src? */
1266 if (ifa->ifa_scope <= scope) {
1267 addr = ifa->ifa_local;
1268 break;
1269 }
1270 /* search for large dst subnet for addr */
1271 same = 0;
1272 }
1273 }
1274 } endfor_ifa(in_dev);
1275
1276 return same ? addr : 0;
1277 }
1278
1279 /*
1280 * Confirm that local IP address exists using wildcards:
1281 * - net: netns to check, cannot be NULL
1282 * - in_dev: only on this interface, NULL=any interface
1283 * - dst: only in the same subnet as dst, 0=any dst
1284 * - local: address, 0=autoselect the local address
1285 * - scope: maximum allowed scope value for the local address
1286 */
1287 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
1288 __be32 dst, __be32 local, int scope)
1289 {
1290 __be32 addr = 0;
1291 struct net_device *dev;
1292
1293 if (in_dev)
1294 return confirm_addr_indev(in_dev, dst, local, scope);
1295
1296 rcu_read_lock();
1297 for_each_netdev_rcu(net, dev) {
1298 in_dev = __in_dev_get_rcu(dev);
1299 if (in_dev) {
1300 addr = confirm_addr_indev(in_dev, dst, local, scope);
1301 if (addr)
1302 break;
1303 }
1304 }
1305 rcu_read_unlock();
1306
1307 return addr;
1308 }
1309 EXPORT_SYMBOL(inet_confirm_addr);
1310
1311 /*
1312 * Device notifier
1313 */
1314
1315 int register_inetaddr_notifier(struct notifier_block *nb)
1316 {
1317 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1318 }
1319 EXPORT_SYMBOL(register_inetaddr_notifier);
1320
1321 int unregister_inetaddr_notifier(struct notifier_block *nb)
1322 {
1323 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1324 }
1325 EXPORT_SYMBOL(unregister_inetaddr_notifier);
1326
1327 /* Rename ifa_labels for a device name change. Make some effort to preserve
1328 * existing alias numbering and to create unique labels if possible.
1329 */
1330 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1331 {
1332 struct in_ifaddr *ifa;
1333 int named = 0;
1334
1335 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1336 char old[IFNAMSIZ], *dot;
1337
1338 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1339 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1340 if (named++ == 0)
1341 goto skip;
1342 dot = strchr(old, ':');
1343 if (!dot) {
1344 sprintf(old, ":%d", named);
1345 dot = old;
1346 }
1347 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1348 strcat(ifa->ifa_label, dot);
1349 else
1350 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1351 skip:
1352 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1353 }
1354 }
1355
1356 static bool inetdev_valid_mtu(unsigned int mtu)
1357 {
1358 return mtu >= 68;
1359 }
1360
1361 static void inetdev_send_gratuitous_arp(struct net_device *dev,
1362 struct in_device *in_dev)
1363
1364 {
1365 struct in_ifaddr *ifa;
1366
1367 for (ifa = in_dev->ifa_list; ifa;
1368 ifa = ifa->ifa_next) {
1369 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1370 ifa->ifa_local, dev,
1371 ifa->ifa_local, NULL,
1372 dev->dev_addr, NULL);
1373 }
1374 }
1375
1376 /* Called only under RTNL semaphore */
1377
1378 static int inetdev_event(struct notifier_block *this, unsigned long event,
1379 void *ptr)
1380 {
1381 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1382 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1383
1384 ASSERT_RTNL();
1385
1386 if (!in_dev) {
1387 if (event == NETDEV_REGISTER) {
1388 in_dev = inetdev_init(dev);
1389 if (IS_ERR(in_dev))
1390 return notifier_from_errno(PTR_ERR(in_dev));
1391 if (dev->flags & IFF_LOOPBACK) {
1392 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1393 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1394 }
1395 } else if (event == NETDEV_CHANGEMTU) {
1396 /* Re-enabling IP */
1397 if (inetdev_valid_mtu(dev->mtu))
1398 in_dev = inetdev_init(dev);
1399 }
1400 goto out;
1401 }
1402
1403 switch (event) {
1404 case NETDEV_REGISTER:
1405 pr_debug("%s: bug\n", __func__);
1406 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1407 break;
1408 case NETDEV_UP:
1409 if (!inetdev_valid_mtu(dev->mtu))
1410 break;
1411 if (dev->flags & IFF_LOOPBACK) {
1412 struct in_ifaddr *ifa = inet_alloc_ifa();
1413
1414 if (ifa) {
1415 INIT_HLIST_NODE(&ifa->hash);
1416 ifa->ifa_local =
1417 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1418 ifa->ifa_prefixlen = 8;
1419 ifa->ifa_mask = inet_make_mask(8);
1420 in_dev_hold(in_dev);
1421 ifa->ifa_dev = in_dev;
1422 ifa->ifa_scope = RT_SCOPE_HOST;
1423 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1424 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1425 INFINITY_LIFE_TIME);
1426 ipv4_devconf_setall(in_dev);
1427 neigh_parms_data_state_setall(in_dev->arp_parms);
1428 inet_insert_ifa(ifa);
1429 }
1430 }
1431 ip_mc_up(in_dev);
1432 /* fall through */
1433 case NETDEV_CHANGEADDR:
1434 if (!IN_DEV_ARP_NOTIFY(in_dev))
1435 break;
1436 /* fall through */
1437 case NETDEV_NOTIFY_PEERS:
1438 /* Send gratuitous ARP to notify of link change */
1439 inetdev_send_gratuitous_arp(dev, in_dev);
1440 break;
1441 case NETDEV_DOWN:
1442 ip_mc_down(in_dev);
1443 break;
1444 case NETDEV_PRE_TYPE_CHANGE:
1445 ip_mc_unmap(in_dev);
1446 break;
1447 case NETDEV_POST_TYPE_CHANGE:
1448 ip_mc_remap(in_dev);
1449 break;
1450 case NETDEV_CHANGEMTU:
1451 if (inetdev_valid_mtu(dev->mtu))
1452 break;
1453 /* disable IP when MTU is not enough */
1454 case NETDEV_UNREGISTER:
1455 inetdev_destroy(in_dev);
1456 break;
1457 case NETDEV_CHANGENAME:
1458 /* Do not notify about label change, this event is
1459 * not interesting to applications using netlink.
1460 */
1461 inetdev_changename(dev, in_dev);
1462
1463 devinet_sysctl_unregister(in_dev);
1464 devinet_sysctl_register(in_dev);
1465 break;
1466 }
1467 out:
1468 return NOTIFY_DONE;
1469 }
1470
1471 static struct notifier_block ip_netdev_notifier = {
1472 .notifier_call = inetdev_event,
1473 };
1474
1475 static size_t inet_nlmsg_size(void)
1476 {
1477 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1478 + nla_total_size(4) /* IFA_ADDRESS */
1479 + nla_total_size(4) /* IFA_LOCAL */
1480 + nla_total_size(4) /* IFA_BROADCAST */
1481 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1482 + nla_total_size(4) /* IFA_FLAGS */
1483 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
1484 }
1485
1486 static inline u32 cstamp_delta(unsigned long cstamp)
1487 {
1488 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1489 }
1490
1491 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1492 unsigned long tstamp, u32 preferred, u32 valid)
1493 {
1494 struct ifa_cacheinfo ci;
1495
1496 ci.cstamp = cstamp_delta(cstamp);
1497 ci.tstamp = cstamp_delta(tstamp);
1498 ci.ifa_prefered = preferred;
1499 ci.ifa_valid = valid;
1500
1501 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1502 }
1503
1504 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1505 u32 portid, u32 seq, int event, unsigned int flags)
1506 {
1507 struct ifaddrmsg *ifm;
1508 struct nlmsghdr *nlh;
1509 u32 preferred, valid;
1510
1511 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
1512 if (!nlh)
1513 return -EMSGSIZE;
1514
1515 ifm = nlmsg_data(nlh);
1516 ifm->ifa_family = AF_INET;
1517 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1518 ifm->ifa_flags = ifa->ifa_flags;
1519 ifm->ifa_scope = ifa->ifa_scope;
1520 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1521
1522 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1523 preferred = ifa->ifa_preferred_lft;
1524 valid = ifa->ifa_valid_lft;
1525 if (preferred != INFINITY_LIFE_TIME) {
1526 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1527
1528 if (preferred > tval)
1529 preferred -= tval;
1530 else
1531 preferred = 0;
1532 if (valid != INFINITY_LIFE_TIME) {
1533 if (valid > tval)
1534 valid -= tval;
1535 else
1536 valid = 0;
1537 }
1538 }
1539 } else {
1540 preferred = INFINITY_LIFE_TIME;
1541 valid = INFINITY_LIFE_TIME;
1542 }
1543 if ((ifa->ifa_address &&
1544 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1545 (ifa->ifa_local &&
1546 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
1547 (ifa->ifa_broadcast &&
1548 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1549 (ifa->ifa_label[0] &&
1550 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1551 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
1552 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1553 preferred, valid))
1554 goto nla_put_failure;
1555
1556 nlmsg_end(skb, nlh);
1557 return 0;
1558
1559 nla_put_failure:
1560 nlmsg_cancel(skb, nlh);
1561 return -EMSGSIZE;
1562 }
1563
1564 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1565 {
1566 struct net *net = sock_net(skb->sk);
1567 int h, s_h;
1568 int idx, s_idx;
1569 int ip_idx, s_ip_idx;
1570 struct net_device *dev;
1571 struct in_device *in_dev;
1572 struct in_ifaddr *ifa;
1573 struct hlist_head *head;
1574
1575 s_h = cb->args[0];
1576 s_idx = idx = cb->args[1];
1577 s_ip_idx = ip_idx = cb->args[2];
1578
1579 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1580 idx = 0;
1581 head = &net->dev_index_head[h];
1582 rcu_read_lock();
1583 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1584 net->dev_base_seq;
1585 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1586 if (idx < s_idx)
1587 goto cont;
1588 if (h > s_h || idx > s_idx)
1589 s_ip_idx = 0;
1590 in_dev = __in_dev_get_rcu(dev);
1591 if (!in_dev)
1592 goto cont;
1593
1594 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1595 ifa = ifa->ifa_next, ip_idx++) {
1596 if (ip_idx < s_ip_idx)
1597 continue;
1598 if (inet_fill_ifaddr(skb, ifa,
1599 NETLINK_CB(cb->skb).portid,
1600 cb->nlh->nlmsg_seq,
1601 RTM_NEWADDR, NLM_F_MULTI) < 0) {
1602 rcu_read_unlock();
1603 goto done;
1604 }
1605 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1606 }
1607 cont:
1608 idx++;
1609 }
1610 rcu_read_unlock();
1611 }
1612
1613 done:
1614 cb->args[0] = h;
1615 cb->args[1] = idx;
1616 cb->args[2] = ip_idx;
1617
1618 return skb->len;
1619 }
1620
1621 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1622 u32 portid)
1623 {
1624 struct sk_buff *skb;
1625 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1626 int err = -ENOBUFS;
1627 struct net *net;
1628
1629 net = dev_net(ifa->ifa_dev->dev);
1630 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1631 if (!skb)
1632 goto errout;
1633
1634 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
1635 if (err < 0) {
1636 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1637 WARN_ON(err == -EMSGSIZE);
1638 kfree_skb(skb);
1639 goto errout;
1640 }
1641 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1642 return;
1643 errout:
1644 if (err < 0)
1645 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1646 }
1647
1648 static size_t inet_get_link_af_size(const struct net_device *dev)
1649 {
1650 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1651
1652 if (!in_dev)
1653 return 0;
1654
1655 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1656 }
1657
1658 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1659 {
1660 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1661 struct nlattr *nla;
1662 int i;
1663
1664 if (!in_dev)
1665 return -ENODATA;
1666
1667 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1668 if (!nla)
1669 return -EMSGSIZE;
1670
1671 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1672 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1673
1674 return 0;
1675 }
1676
1677 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1678 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1679 };
1680
1681 static int inet_validate_link_af(const struct net_device *dev,
1682 const struct nlattr *nla)
1683 {
1684 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1685 int err, rem;
1686
1687 if (dev && !__in_dev_get_rtnl(dev))
1688 return -EAFNOSUPPORT;
1689
1690 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1691 if (err < 0)
1692 return err;
1693
1694 if (tb[IFLA_INET_CONF]) {
1695 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1696 int cfgid = nla_type(a);
1697
1698 if (nla_len(a) < 4)
1699 return -EINVAL;
1700
1701 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1702 return -EINVAL;
1703 }
1704 }
1705
1706 return 0;
1707 }
1708
1709 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1710 {
1711 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1712 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1713 int rem;
1714
1715 if (!in_dev)
1716 return -EAFNOSUPPORT;
1717
1718 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1719 BUG();
1720
1721 if (tb[IFLA_INET_CONF]) {
1722 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1723 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1724 }
1725
1726 return 0;
1727 }
1728
1729 static int inet_netconf_msgsize_devconf(int type)
1730 {
1731 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1732 + nla_total_size(4); /* NETCONFA_IFINDEX */
1733
1734 /* type -1 is used for ALL */
1735 if (type == -1 || type == NETCONFA_FORWARDING)
1736 size += nla_total_size(4);
1737 if (type == -1 || type == NETCONFA_RP_FILTER)
1738 size += nla_total_size(4);
1739 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1740 size += nla_total_size(4);
1741 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
1742 size += nla_total_size(4);
1743 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
1744 size += nla_total_size(4);
1745
1746 return size;
1747 }
1748
1749 static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1750 struct ipv4_devconf *devconf, u32 portid,
1751 u32 seq, int event, unsigned int flags,
1752 int type)
1753 {
1754 struct nlmsghdr *nlh;
1755 struct netconfmsg *ncm;
1756
1757 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1758 flags);
1759 if (!nlh)
1760 return -EMSGSIZE;
1761
1762 ncm = nlmsg_data(nlh);
1763 ncm->ncm_family = AF_INET;
1764
1765 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1766 goto nla_put_failure;
1767
1768 /* type -1 is used for ALL */
1769 if ((type == -1 || type == NETCONFA_FORWARDING) &&
1770 nla_put_s32(skb, NETCONFA_FORWARDING,
1771 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1772 goto nla_put_failure;
1773 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1774 nla_put_s32(skb, NETCONFA_RP_FILTER,
1775 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1776 goto nla_put_failure;
1777 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1778 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1779 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1780 goto nla_put_failure;
1781 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
1782 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
1783 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
1784 goto nla_put_failure;
1785 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
1786 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
1787 IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
1788 goto nla_put_failure;
1789
1790 nlmsg_end(skb, nlh);
1791 return 0;
1792
1793 nla_put_failure:
1794 nlmsg_cancel(skb, nlh);
1795 return -EMSGSIZE;
1796 }
1797
1798 void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1799 struct ipv4_devconf *devconf)
1800 {
1801 struct sk_buff *skb;
1802 int err = -ENOBUFS;
1803
1804 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
1805 if (!skb)
1806 goto errout;
1807
1808 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1809 RTM_NEWNETCONF, 0, type);
1810 if (err < 0) {
1811 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1812 WARN_ON(err == -EMSGSIZE);
1813 kfree_skb(skb);
1814 goto errout;
1815 }
1816 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1817 return;
1818 errout:
1819 if (err < 0)
1820 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1821 }
1822
1823 static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1824 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1825 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
1826 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
1827 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
1828 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
1829 };
1830
1831 static int inet_netconf_get_devconf(struct sk_buff *in_skb,
1832 struct nlmsghdr *nlh)
1833 {
1834 struct net *net = sock_net(in_skb->sk);
1835 struct nlattr *tb[NETCONFA_MAX+1];
1836 struct netconfmsg *ncm;
1837 struct sk_buff *skb;
1838 struct ipv4_devconf *devconf;
1839 struct in_device *in_dev;
1840 struct net_device *dev;
1841 int ifindex;
1842 int err;
1843
1844 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1845 devconf_ipv4_policy);
1846 if (err < 0)
1847 goto errout;
1848
1849 err = EINVAL;
1850 if (!tb[NETCONFA_IFINDEX])
1851 goto errout;
1852
1853 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1854 switch (ifindex) {
1855 case NETCONFA_IFINDEX_ALL:
1856 devconf = net->ipv4.devconf_all;
1857 break;
1858 case NETCONFA_IFINDEX_DEFAULT:
1859 devconf = net->ipv4.devconf_dflt;
1860 break;
1861 default:
1862 dev = __dev_get_by_index(net, ifindex);
1863 if (!dev)
1864 goto errout;
1865 in_dev = __in_dev_get_rtnl(dev);
1866 if (!in_dev)
1867 goto errout;
1868 devconf = &in_dev->cnf;
1869 break;
1870 }
1871
1872 err = -ENOBUFS;
1873 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
1874 if (!skb)
1875 goto errout;
1876
1877 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1878 NETLINK_CB(in_skb).portid,
1879 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1880 -1);
1881 if (err < 0) {
1882 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1883 WARN_ON(err == -EMSGSIZE);
1884 kfree_skb(skb);
1885 goto errout;
1886 }
1887 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1888 errout:
1889 return err;
1890 }
1891
1892 static int inet_netconf_dump_devconf(struct sk_buff *skb,
1893 struct netlink_callback *cb)
1894 {
1895 struct net *net = sock_net(skb->sk);
1896 int h, s_h;
1897 int idx, s_idx;
1898 struct net_device *dev;
1899 struct in_device *in_dev;
1900 struct hlist_head *head;
1901
1902 s_h = cb->args[0];
1903 s_idx = idx = cb->args[1];
1904
1905 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1906 idx = 0;
1907 head = &net->dev_index_head[h];
1908 rcu_read_lock();
1909 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1910 net->dev_base_seq;
1911 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1912 if (idx < s_idx)
1913 goto cont;
1914 in_dev = __in_dev_get_rcu(dev);
1915 if (!in_dev)
1916 goto cont;
1917
1918 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1919 &in_dev->cnf,
1920 NETLINK_CB(cb->skb).portid,
1921 cb->nlh->nlmsg_seq,
1922 RTM_NEWNETCONF,
1923 NLM_F_MULTI,
1924 -1) < 0) {
1925 rcu_read_unlock();
1926 goto done;
1927 }
1928 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1929 cont:
1930 idx++;
1931 }
1932 rcu_read_unlock();
1933 }
1934 if (h == NETDEV_HASHENTRIES) {
1935 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1936 net->ipv4.devconf_all,
1937 NETLINK_CB(cb->skb).portid,
1938 cb->nlh->nlmsg_seq,
1939 RTM_NEWNETCONF, NLM_F_MULTI,
1940 -1) < 0)
1941 goto done;
1942 else
1943 h++;
1944 }
1945 if (h == NETDEV_HASHENTRIES + 1) {
1946 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1947 net->ipv4.devconf_dflt,
1948 NETLINK_CB(cb->skb).portid,
1949 cb->nlh->nlmsg_seq,
1950 RTM_NEWNETCONF, NLM_F_MULTI,
1951 -1) < 0)
1952 goto done;
1953 else
1954 h++;
1955 }
1956 done:
1957 cb->args[0] = h;
1958 cb->args[1] = idx;
1959
1960 return skb->len;
1961 }
1962
1963 #ifdef CONFIG_SYSCTL
1964
1965 static void devinet_copy_dflt_conf(struct net *net, int i)
1966 {
1967 struct net_device *dev;
1968
1969 rcu_read_lock();
1970 for_each_netdev_rcu(net, dev) {
1971 struct in_device *in_dev;
1972
1973 in_dev = __in_dev_get_rcu(dev);
1974 if (in_dev && !test_bit(i, in_dev->cnf.state))
1975 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1976 }
1977 rcu_read_unlock();
1978 }
1979
1980 /* called with RTNL locked */
1981 static void inet_forward_change(struct net *net)
1982 {
1983 struct net_device *dev;
1984 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1985
1986 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1987 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1988 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1989 NETCONFA_IFINDEX_ALL,
1990 net->ipv4.devconf_all);
1991 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1992 NETCONFA_IFINDEX_DEFAULT,
1993 net->ipv4.devconf_dflt);
1994
1995 for_each_netdev(net, dev) {
1996 struct in_device *in_dev;
1997 if (on)
1998 dev_disable_lro(dev);
1999 rcu_read_lock();
2000 in_dev = __in_dev_get_rcu(dev);
2001 if (in_dev) {
2002 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
2003 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2004 dev->ifindex, &in_dev->cnf);
2005 }
2006 rcu_read_unlock();
2007 }
2008 }
2009
2010 static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2011 {
2012 if (cnf == net->ipv4.devconf_dflt)
2013 return NETCONFA_IFINDEX_DEFAULT;
2014 else if (cnf == net->ipv4.devconf_all)
2015 return NETCONFA_IFINDEX_ALL;
2016 else {
2017 struct in_device *idev
2018 = container_of(cnf, struct in_device, cnf);
2019 return idev->dev->ifindex;
2020 }
2021 }
2022
2023 static int devinet_conf_proc(struct ctl_table *ctl, int write,
2024 void __user *buffer,
2025 size_t *lenp, loff_t *ppos)
2026 {
2027 int old_value = *(int *)ctl->data;
2028 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2029 int new_value = *(int *)ctl->data;
2030
2031 if (write) {
2032 struct ipv4_devconf *cnf = ctl->extra1;
2033 struct net *net = ctl->extra2;
2034 int i = (int *)ctl->data - cnf->data;
2035 int ifindex;
2036
2037 set_bit(i, cnf->state);
2038
2039 if (cnf == net->ipv4.devconf_dflt)
2040 devinet_copy_dflt_conf(net, i);
2041 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2042 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
2043 if ((new_value == 0) && (old_value != 0))
2044 rt_cache_flush(net);
2045
2046 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2047 new_value != old_value) {
2048 ifindex = devinet_conf_ifindex(net, cnf);
2049 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
2050 ifindex, cnf);
2051 }
2052 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2053 new_value != old_value) {
2054 ifindex = devinet_conf_ifindex(net, cnf);
2055 inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
2056 ifindex, cnf);
2057 }
2058 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2059 new_value != old_value) {
2060 ifindex = devinet_conf_ifindex(net, cnf);
2061 inet_netconf_notify_devconf(net, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2062 ifindex, cnf);
2063 }
2064 }
2065
2066 return ret;
2067 }
2068
2069 static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
2070 void __user *buffer,
2071 size_t *lenp, loff_t *ppos)
2072 {
2073 int *valp = ctl->data;
2074 int val = *valp;
2075 loff_t pos = *ppos;
2076 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2077
2078 if (write && *valp != val) {
2079 struct net *net = ctl->extra2;
2080
2081 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2082 if (!rtnl_trylock()) {
2083 /* Restore the original values before restarting */
2084 *valp = val;
2085 *ppos = pos;
2086 return restart_syscall();
2087 }
2088 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2089 inet_forward_change(net);
2090 } else {
2091 struct ipv4_devconf *cnf = ctl->extra1;
2092 struct in_device *idev =
2093 container_of(cnf, struct in_device, cnf);
2094 if (*valp)
2095 dev_disable_lro(idev->dev);
2096 inet_netconf_notify_devconf(net,
2097 NETCONFA_FORWARDING,
2098 idev->dev->ifindex,
2099 cnf);
2100 }
2101 rtnl_unlock();
2102 rt_cache_flush(net);
2103 } else
2104 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2105 NETCONFA_IFINDEX_DEFAULT,
2106 net->ipv4.devconf_dflt);
2107 }
2108
2109 return ret;
2110 }
2111
2112 static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2113 void __user *buffer,
2114 size_t *lenp, loff_t *ppos)
2115 {
2116 int *valp = ctl->data;
2117 int val = *valp;
2118 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2119 struct net *net = ctl->extra2;
2120
2121 if (write && *valp != val)
2122 rt_cache_flush(net);
2123
2124 return ret;
2125 }
2126
2127 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2128 { \
2129 .procname = name, \
2130 .data = ipv4_devconf.data + \
2131 IPV4_DEVCONF_ ## attr - 1, \
2132 .maxlen = sizeof(int), \
2133 .mode = mval, \
2134 .proc_handler = proc, \
2135 .extra1 = &ipv4_devconf, \
2136 }
2137
2138 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2139 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2140
2141 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2142 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2143
2144 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2145 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2146
2147 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2148 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2149
2150 static struct devinet_sysctl_table {
2151 struct ctl_table_header *sysctl_header;
2152 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2153 } devinet_sysctl = {
2154 .devinet_vars = {
2155 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2156 devinet_sysctl_forward),
2157 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2158
2159 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2160 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2161 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2162 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2163 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2164 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2165 "accept_source_route"),
2166 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2167 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2168 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2169 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2170 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2171 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2172 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2173 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2174 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2175 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2176 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2177 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2178 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2179 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2180 "force_igmp_version"),
2181 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2182 "igmpv2_unsolicited_report_interval"),
2183 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2184 "igmpv3_unsolicited_report_interval"),
2185 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2186 "ignore_routes_with_linkdown"),
2187
2188 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2189 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2190 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2191 "promote_secondaries"),
2192 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2193 "route_localnet"),
2194 },
2195 };
2196
2197 static int __devinet_sysctl_register(struct net *net, char *dev_name,
2198 struct ipv4_devconf *p)
2199 {
2200 int i;
2201 struct devinet_sysctl_table *t;
2202 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2203
2204 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2205 if (!t)
2206 goto out;
2207
2208 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2209 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2210 t->devinet_vars[i].extra1 = p;
2211 t->devinet_vars[i].extra2 = net;
2212 }
2213
2214 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2215
2216 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2217 if (!t->sysctl_header)
2218 goto free;
2219
2220 p->sysctl = t;
2221 return 0;
2222
2223 free:
2224 kfree(t);
2225 out:
2226 return -ENOBUFS;
2227 }
2228
2229 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2230 {
2231 struct devinet_sysctl_table *t = cnf->sysctl;
2232
2233 if (!t)
2234 return;
2235
2236 cnf->sysctl = NULL;
2237 unregister_net_sysctl_table(t->sysctl_header);
2238 kfree(t);
2239 }
2240
2241 static int devinet_sysctl_register(struct in_device *idev)
2242 {
2243 int err;
2244
2245 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2246 return -EINVAL;
2247
2248 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2249 if (err)
2250 return err;
2251 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2252 &idev->cnf);
2253 if (err)
2254 neigh_sysctl_unregister(idev->arp_parms);
2255 return err;
2256 }
2257
2258 static void devinet_sysctl_unregister(struct in_device *idev)
2259 {
2260 __devinet_sysctl_unregister(&idev->cnf);
2261 neigh_sysctl_unregister(idev->arp_parms);
2262 }
2263
2264 static struct ctl_table ctl_forward_entry[] = {
2265 {
2266 .procname = "ip_forward",
2267 .data = &ipv4_devconf.data[
2268 IPV4_DEVCONF_FORWARDING - 1],
2269 .maxlen = sizeof(int),
2270 .mode = 0644,
2271 .proc_handler = devinet_sysctl_forward,
2272 .extra1 = &ipv4_devconf,
2273 .extra2 = &init_net,
2274 },
2275 { },
2276 };
2277 #endif
2278
2279 static __net_init int devinet_init_net(struct net *net)
2280 {
2281 int err;
2282 struct ipv4_devconf *all, *dflt;
2283 #ifdef CONFIG_SYSCTL
2284 struct ctl_table *tbl = ctl_forward_entry;
2285 struct ctl_table_header *forw_hdr;
2286 #endif
2287
2288 err = -ENOMEM;
2289 all = &ipv4_devconf;
2290 dflt = &ipv4_devconf_dflt;
2291
2292 if (!net_eq(net, &init_net)) {
2293 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2294 if (!all)
2295 goto err_alloc_all;
2296
2297 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2298 if (!dflt)
2299 goto err_alloc_dflt;
2300
2301 #ifdef CONFIG_SYSCTL
2302 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2303 if (!tbl)
2304 goto err_alloc_ctl;
2305
2306 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2307 tbl[0].extra1 = all;
2308 tbl[0].extra2 = net;
2309 #endif
2310 }
2311
2312 #ifdef CONFIG_SYSCTL
2313 err = __devinet_sysctl_register(net, "all", all);
2314 if (err < 0)
2315 goto err_reg_all;
2316
2317 err = __devinet_sysctl_register(net, "default", dflt);
2318 if (err < 0)
2319 goto err_reg_dflt;
2320
2321 err = -ENOMEM;
2322 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2323 if (!forw_hdr)
2324 goto err_reg_ctl;
2325 net->ipv4.forw_hdr = forw_hdr;
2326 #endif
2327
2328 net->ipv4.devconf_all = all;
2329 net->ipv4.devconf_dflt = dflt;
2330 return 0;
2331
2332 #ifdef CONFIG_SYSCTL
2333 err_reg_ctl:
2334 __devinet_sysctl_unregister(dflt);
2335 err_reg_dflt:
2336 __devinet_sysctl_unregister(all);
2337 err_reg_all:
2338 if (tbl != ctl_forward_entry)
2339 kfree(tbl);
2340 err_alloc_ctl:
2341 #endif
2342 if (dflt != &ipv4_devconf_dflt)
2343 kfree(dflt);
2344 err_alloc_dflt:
2345 if (all != &ipv4_devconf)
2346 kfree(all);
2347 err_alloc_all:
2348 return err;
2349 }
2350
2351 static __net_exit void devinet_exit_net(struct net *net)
2352 {
2353 #ifdef CONFIG_SYSCTL
2354 struct ctl_table *tbl;
2355
2356 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2357 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2358 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2359 __devinet_sysctl_unregister(net->ipv4.devconf_all);
2360 kfree(tbl);
2361 #endif
2362 kfree(net->ipv4.devconf_dflt);
2363 kfree(net->ipv4.devconf_all);
2364 }
2365
2366 static __net_initdata struct pernet_operations devinet_ops = {
2367 .init = devinet_init_net,
2368 .exit = devinet_exit_net,
2369 };
2370
2371 static struct rtnl_af_ops inet_af_ops __read_mostly = {
2372 .family = AF_INET,
2373 .fill_link_af = inet_fill_link_af,
2374 .get_link_af_size = inet_get_link_af_size,
2375 .validate_link_af = inet_validate_link_af,
2376 .set_link_af = inet_set_link_af,
2377 };
2378
2379 void __init devinet_init(void)
2380 {
2381 int i;
2382
2383 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2384 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2385
2386 register_pernet_subsys(&devinet_ops);
2387
2388 register_gifconf(PF_INET, inet_gifconf);
2389 register_netdevice_notifier(&ip_netdev_notifier);
2390
2391 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
2392
2393 rtnl_af_register(&inet_af_ops);
2394
2395 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2396 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2397 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
2398 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2399 inet_netconf_dump_devconf, NULL);
2400 }
2401
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